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7616422 |
Over current protection circuit for power supplies
An over current protection circuit provides over current protection (O.C.P) and short current protection (S.C.P) and can selectively operate in auto recover mode or latch off mode by replacing...
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7595969 |
Undervoltage warning method, undervoltage warning circuit and switching power supply
A method for identifying a cause for insufficiency of an output voltage reduced to or below an undervoltage set value comprises a first comparison step for comparing the output voltage to a fixed...
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7583060 |
Protective circuit for a secondary battery pack and method of operating the same
A protective circuit for a secondary battery pack advantageously having a simple circuit configuration while maintaining the safety of banks in the circuit. Each protective circuit has banks...
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7573393 |
Integrated fault output/fault response delay circuit
A time delay fault device includes an integrated circuit (IC) having an electronic circuit having a fault indicator signal output and a time delay circuit having an input connected to the fault...
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7499252 |
Driver circuit
A driver circuit for an electronic switch, the driver circuit having a first input for receiving a first control signal, and a second input for receiving a signal from a current sensor, the driver...
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7468877 |
Overcurrent detection circuit and power supply apparatus provided therewith
An overcurrent detection circuit that detects an overcurrent state of a transistor that outputs a current to a load is provided with a start-up monitoring portion that distinguishes between a...
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7440246 |
Circuit interrupting apparatus with remote test and reset activation
The present disclosure relates to resettable circuit interrupting devices and apparatus capable of being tested and reset from remote locations, and in particular to portable circuit interrupting...
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7417840 |
Self-supplied electronic protection device for automatic circuit-breakers
An electronic self-supplied protection device for automatic circuit-breakers that includes: a supply device that draws energy from the stretch of electrical network protected by said...
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7408750 |
Methods of detecting arc faults characterized by consecutive periods of arcing
An apparatus and method for detecting electrical arc faults that has reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, an input sense circuit, an arcing sense...
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7379284 |
Switching control circuit and self-excited DC-DC converter
A self-excited DC-DC converter comprises a switching element that chops a direct-current input voltage; a smoothing circuit that smoothes the chopped voltage to generate a DC output voltage; a...
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7376359 |
Digital regulated light receive module and regulation method
The invention discloses a digital adjusting method for an optical receiver module, and the method implements real-time monitor of parameters, on-line adjustment and non-linear compensation. The...
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7330343 |
Current-limiting protection circuit for a power supply
The present invention discloses a current-limiting protection circuit for a power supply, which applies to a power supply that has a maximum power-limiting function, wherein the user will be...
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7280338 |
Power supply circuit, back-pack power supply module and circuit interrupter including the same
A back-pack power supply module is for a circuit interrupter including an elongated line conductor. The back-pack power supply module includes a housing having an opening therethrough. The opening...
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7262574 |
Robot overcurrent prevention system
In an overcurrent prevention system for a robot having links connected by joints and an electrical system including electric motors installed at the joint, a power circuit connecting the electric...
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7245465 |
Voltage regulator
A voltage regulator has an output circuit for producing from an input voltage a predetermined output voltage to be supplied to a load, an overcurrent protection circuit for preventing overcurrent...
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7233470 |
Distance relay apparatus
A distance relay apparatus includes a directional relay element which performs computation to detect a fault, which occurs in the forward direction from an installing point of the relay apparatus,...
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7126802 |
Drive circuit for switching device
A drive circuit 21 that controls a switching device 23 ON/OFF and a soft cutoff command circuit that gradually decreases the gate terminal voltage of the switching device 23 when short...
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7064946 |
Electronic fuse
An electronic fuse comprising an integrated circuit having a control output terminal coupled to a control electrode of a power semiconductor switching device, the power semiconductor switching...
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7046155 |
Fault detection system
A fault detection system detecting malfunctions or deteriorations, which may result in an inverter fault, is provided. The system has a temperature sensor installed on a semiconductor module to...
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6999293 |
Safety device for a delta-connected three-phase electric appliance
A safety device for use in conjunction with a delta-connected three-phase electric appliance. The electric appliance is supplied in a delta connection so that the loads ( 100, 101, 102 ) of the...
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6952356 |
Adaptive over-current detection
Disclosed are methods and apparatus for over-current detection in PWM power stages. Disclosed methods and apparatus provide over-current detection with adaptive filtering according to the pulse...
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6909586 |
Circuit breaker voltage sensing module
A combined current and voltage sensor includes: a combined sensor shell; a current sensor located in the combined sensor shell, the current sensor disposed proximate to said first load strap; and a...
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6870723 |
Configuration comprising two contactors connected in series
An arrangement includes two series-connected switching contacts in two contactors. The tripping signal thereof is generated with a variable time offset so that the number of disconnection processes...
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6847532 |
System and method to eliminate the dead time influence in a pwm-driven system
A system and method to eliminate the influence of Dead Time delay in a PWM driven system. The system is implemented using a switching control circuit to operate a pair of upper and lower switching...
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6744612 |
Inrush current protection circuit
The invention relates to an inrush current protection circuit for a power supply. The power supply includes a rectification circuit coupled to a main body of the power supply through an...
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6717783 |
Short circuit power limiter
The present invention provides a short circuit power limiter circuit having a current sensor and a power limiter. The short circuit sensor sends a short circuit flag signal to the power limiter...
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6687106 |
Power module
A power module including a self arc-extinguishing type semiconductor such as an IGBT and having a function to protect the semiconductor, i.e., to protect the IGBT against a short-circuit current....
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6683765 |
Switching power unit
In a switching power unit for performing an overcurrent protecting operation by shortening a switching pulse, an oscillation frequency changing circuit drops an oscillation frequency of an...
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6654216 |
Distributed monitoring and protection system for a distributed power network
A distributed monitoring and protection system for a distributed power network. The system includes a plurality of high-speed measuring units (MUs), wherein each MU is coupled to a power line to...
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6646849 |
Digital power inverter and method of controlling the same
A digital electric power inverter comprising: a CPU, a PWM driving circuit, a PWM converting circuit, a rectifying circuit, an AC driving circuit, a DC/AC inverting circuit, a plurality of...
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6646450 |
Method and apparatus for near losslessly measuring inductor current
The present invention provides an improved measuring circuit for measuring a current of an inductor with minimum losses and errors. According to one embodiment of the invention, the measuring...
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6639777 |
Electronic timer switch
A timer switch for suspending the application of a direct current input voltage to a load upon the detection of a voltage irregularity in the input voltage. The timer switch includes a transistor...
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6603649 |
Electronic tripping device for a circuit breaker
An electronic tripping device for a circuit breaker contains circuitry for simulating the response curve of a fuse. This circuitry can be controlled by a single setting mechanism representing the...
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6590757 |
Method and apparatus for detecting and suppressing a parallel arc fault
Electrical equipment ( 14 ) is safeguarded from damage due to parallel arc faults by a circuit that provides several levels of protection. A semiconductor switch ( 18 ) and a current sensor ( 24 )...
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6542345 |
Circuit breaker
In order to provide a circuit breaker, in particular a residual-current circuit breaker or residual-current device, having a variable time delay, which firstly has a stable no-trip response to...
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6534991 |
Connection tester for an electronic trip unit
A trip unit connection tester ( 10 ) is arranged to test the electrical connections ( 12 ) and ( 14 ) between a trip unit ( 16 ) and actuator ( 18 ) mounted within a circuit breaker ( 20 ). Tester...
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6532405 |
Method for detecting a locked axle on a locomotive AC traction motor
An exemplary embodiment of the invention is a method for detecting a potentially locked axle on a vehicle propelled by an AC motor. The method includes conducting a speed test by estimating axle...
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6522509 |
Arc fault detection in ac electric power systems
Arc faults in ac electric power systems including aircraft 400 Hz and other such ac electrical systems are detected by an arc fault detector generating a time attenuated cumulative sum of amounts...
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6512380 |
Contactor and trip circuit therefor
A contactor includes a switching circuit for switching a load between one or more electrical supplies, a current detector for detecting the current flowing through the load, a trip circuit for...
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6507654 |
Line interface battery feed arrangements with PTC resistors
A telephone line interface circuit is disclosed that functions with use of PTC resistors so that temperature increases within the battery feed resistors is minimized. Utilizing current and voltage...
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6400544 |
Current limiting using capacitor charge measurement
Current limiting using capacitor charge measurement to limit the supply current or load current of a circuit, or the current flowing through a device or switch, to prevent the time average current...
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6392422 |
Monitoring insulation and fault current in an A/C current network to provide load shutoff whenever differential current exceeds a certain response value
A method and device for monitoring insulation and fault current in an electrical alternating current network. The differential current formed by vectorial addition is detected between at least two...
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6388854 |
Load balancing and distributing switch-on control for a circuit breaker, an appliance, a device, or an apparatus
The present invention is a load balancing and distributing switch-on/turn-on control for a circuit breaker, an appliance, a device, or an apparatus wherein each switch-on device on a circuit...
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6381113 |
Leakage current protection device adapted to a wide variety of domestic and international applications
A leakage current protection device, such as a ground fault circuit interrupter (GFCI), is provided that can be used in single phase or polyphase systems, with a range of input voltages from 70 to...
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6380722 |
Method to increase the efficiency of a power switching device
A method for limiting a switching current and limiting a voltage drop across a circuit includes the steps of limiting a current sent from a power source to a switching device during a turn on time...
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6369533 |
Piloting circuit for an inductive load in particular for a DC electric motor
A piloting circuit comprises a circuit branch which is intended to be connected to a DC voltage supply source in such a way as to receive a voltage of predetermined polarity, and in which the...
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6356425 |
Timer-thermal-overload shutoff apparatus
A timer-thermal shutoff apparatus can control and protect an electrical appliance. The timer-thermal shutoff apparatus comprises a housing; male connector extending from the housing; female...
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6356423 |
Soild state protection circuit for electrical apparatus
Electrical equipment is safeguarded from damage due to faults by a circuit that provides several levels of protection. A semiconductor switch and a current sensor are placed in series with the...
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6330141 |
Electronic protective relay with variable and fixed delay tally time of current protection
An electronic protective relay emulates an electromechanical protective relay so that operation of the two types of relays can be coordinated in providing protection in an electric power...
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6324041 |
Protection circuit for traveling wave tubes having multiple input tones
A protection circuit (30) for a Traveling Wave Tube having multiple tone operation. The protection circuit (30) is a dual sensor (52, 54) arrangement. One sensor (52) is an operational amplifier...
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